DPDK usage discussions
 help / color / mirror / Atom feed
From: 赖香武 <15310488637@163.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: "David Marchand" <david.marchand@redhat.com>,
	users <users@dpdk.org>,
	 "Richardson, Bruce" <bruce.richardson@intel.com>
Subject: Re:RE: Aboud DPDK Multi-Process
Date: Thu, 4 Nov 2021 21:53:37 +0800 (CST)
Message-ID: <61b7bd42.d020.17ceb39f905.Coremail.15310488637@163.com> (raw)
In-Reply-To: <PH0PR11MB50934FE9B886B102C8228950F78D9@PH0PR11MB5093.namprd11.prod.outlook.com>

[-- Attachment #1: Type: text/plain, Size: 2218 bytes --]

Thank you for all your answer.
I asked this question because I want to use dual processes to complete the hot upgrade of ovs-vswitchd. When ovs-dpdk starts, rte_eal_init will be called to complete dpdk initialization. 
The old process dpdk uses primary to start, and the new process dpdk uses secondary to start and upgrade. After completion, the old process exits, that is, the primary exits. At this time, how does the secondary process become the primary process without disconnecting the network?













--

它山之石,可以攻玉。





在 2021-11-04 17:41:02,"Burakov, Anatoly" <anatoly.burakov@intel.com> 写道:
>> -----Original Message-----
>> From: David Marchand <david.marchand@redhat.com>
>> Sent: Thursday, November 4, 2021 8:30 AM
>> To: 赖香武 <15310488637@163.com>
>> Cc: users <users@dpdk.org>; Burakov, Anatoly
>> <anatoly.burakov@intel.com>; Richardson, Bruce
>> <bruce.richardson@intel.com>
>> Subject: Re: Aboud DPDK Multi-Process
>> 
>> On Thu, Nov 4, 2021 at 9:21 AM 赖香武 <15310488637@163.com> wrote:
>> >
>> > Hello, I have a question about dpdk multi-process. After starting the
>> > primary process and the secondary process, when the current primary
>> > process exits, how does the secondary process become a new primary
>> > process to make the program continue? Hope to get your answer, thank
>> > you!
>> 
>> Not sure why you need this, but DPDK won't do for you.
>> 
>> The process type is decided once at DPDK init, and that is something that
>> affects how your program behaves after.
>> Switching type while running would break assumptions in the DPDK drivers
>> and libraries.
>> 
>> One thing that comes to mind, is that you could try to call
>> rte_eal_cleanup() and call rte_eal_init() again.
>> This is probably something that is not tested (so I'd expect issues, maybe
>> leaks etc..).
>> 
>> But then, you probably want to restart your process entirely.
>
>[[AB]] 
>Calling rte_eal_init() twice would be a terrible idea, because not everything (not even remotely!) gets cleaned up with rte_eal_cleanup(), and a lot of stuff is allocated statically.
>
>So, as far as I'm concerned, this usage scenario is considered to be unsupported.
>
>> 
>> 
>> --
>> David Marchand
>

[-- Attachment #2: Type: text/html, Size: 3016 bytes --]

  reply	other threads:[~2021-11-04 13:53 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-04  8:21 赖香武
2021-11-04  8:30 ` David Marchand
2021-11-04  9:41   ` Burakov, Anatoly
2021-11-04 13:53     ` 赖香武 [this message]
2021-11-04 15:04       ` Burakov, Anatoly
2021-11-05  2:53         ` 赖香武
2021-11-05  8:55           ` Richardson, Bruce
2021-11-05  9:34             ` 赖香武
2021-11-05  9:55               ` Richardson, Bruce

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=61b7bd42.d020.17ceb39f905.Coremail.15310488637@163.com \
    --to=15310488637@163.com \
    --cc=anatoly.burakov@intel.com \
    --cc=bruce.richardson@intel.com \
    --cc=david.marchand@redhat.com \
    --cc=users@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK usage discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror http://inbox.dpdk.org/users/0 users/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 users users/ http://inbox.dpdk.org/users \
		users@dpdk.org
	public-inbox-index users

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.users


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git